Gigaset C610 IP Quick Start Manual page 6

4. Enter 0000 followed by OK. After a short
time a green tick will be displayed
alongside the message "Handset
registered". The telephone is now ready
for use.
If you wish to connect a different handset,
please see the instructions for the handset
you want to connect.
You can find information on which Gigaset
products are compatible with the Gigaset
C610 IP-base at Gigasets homepage at
www.gigaset.com under "Support".
3. Press the register button on the
front of the base until the
message "Please enter system
PIN" is displayed on the Gigaset
C610H handset.